It appears you have learned a small lesson.
We only lose what we didn't backup. As I noted, HTML saves are treacherous since the save would have the HTML as well as possibly a dozen files and other folders. If you didn't save or restore these, what you noted will happen.
Windows does have a search for .DOC and more so you use that and hope it finds it.
If you have the .HTML opening in Word and it's blank, the restore is incomplete and you need to find the rest of the files. I can't guess where you put the backups.